WIV Labs, the company behind Korean search engine Daum, has just unveiled a beta version of question and answer site, Qaster. Unlike similar knowledge crowdsourcing services like Yahoo Answers and Quora, Qaster relies entirely on an existing service for its Q&As — namely, Twitter. Enter a key word into the dialog box and the service will bring up all of the matching questions asked by users on the microblogging site. And just like Twitter, you can retweet or favorite the questions and answers you like best.